Which statement best differentiates between the Rust Belt region and the rest of the United States

The Rust Belt is a functional region characterized by similar historic economic activity, specifically, agriculture.
• The Rust Belt is a functional region characterized by similar historic economic activity, specifically, manufacturing.
• The Rust Belt is a formal region surrounded by functional regions
• The Rust Belt is a formal region surrounded by functional regions.
The Rust Belt is a perceptual region that is commonly referred to as such because of its past prominence as an
° ecoregion

• The Rust Belt is a functional region characterized by similar historic economic activity, specifically, manufacturing.

The statement that best differentiates between the Rust Belt region and the rest of the United States is:

"The Rust Belt is a functional region characterized by similar historic economic activity, specifically, manufacturing."